Vat dyestuff.



No Drawing.

UNITED STATES PATENT ()FFIOE.

MAX HESS FINLAND, OF HljCHST-ON-THE-MAIN. GERMANY, ASSIGNOR T FARBWERKE VOBM. MEISTER LUGIUS & BRU'NING, OF HfiCHST-ON-THE-MAIN, GERMANY, A COR- I 'OBA'.[ION OF GERMANY.

Specification of Letters Patent.

Application filed September 26, 1910. Serial No. 583,916. I

VAT DYESTUFF.

Patented Aug. 8 1911.

' To all whom 'it may concern:

Be it I m-own that I, Max HE ssnNLANn Ph.'D.-, chemist, a citizen of the Empire of Germany, residing at Hochst-on-the-Mam,

Germany, have invented certain new and useful Improvements in Vat Dyestuffs, of

which the following is a specification.

' ,I have found that dianthraquinonylamins which contains the thioxanthone group are vat-dyestuifs of great value. They are derived from the anthraquinonethioxanthone of the constitution:

and can be obtained by treating the aminoor the halogen-anthraquinone-thioxanthones with halogen-, respectively amino-, derivatives of the anthraquinone.

The new dyestufl's are red to grayish-blue powders, difiicultly soluble in the usual solvents, soluble in concentrated sulfuric acid.

tion-product may be heated with diluted nitric acid for removing copper; it forms a red powder diflicultly soluble in the usual 5.6-anthra uinone thioxanthone with 1.5

dichlorant raquinone or with 1-chloro-5.6 anthraquinine-thioxanthone, or by treating 1 chloro 5 6 'anthraquinone thioxanthone with aor B-aminoanthraquinone.

Having now described my invention, what I claim is: Y

1. As new products, anthraquinone-thi oxanthones which are also'dianthraquinonylamins, being red to grayish-blue powders, diflicultly soluble in the usual solvents, solu ble in concentrated sulfuric acid, yielding, when treated with an alkaline'hydrosulfite solution, ish-blue tints of excellent fast-ness.

2. As a new product, the l -anthraquinonylamin 5.6-anthraquinone-thioxanthone, obtainable by combining 1-amino-5.6-thioxanthone with a-chloroanthraquinone, bein a red powder, difiicultly soluble in the usua solvents, soluble in concentrated sulfuric acid, and yielding, when treated with an alkaline hydrosulfite solution, a brownishviolet vat which dyes cotton claret-red tints of excellent fastness.

In testimony whereof, I aiiix my signature in presence of two witnesses.

MAX HESSENLAND.

Witnesses:

JEAN GRUND, CARL GRUND.

Similar vats which dye cotton red to gray- Copies of this patent may be obtained for five cents each-,byaddressing the Commissioner of Patents,

' Washington, D. 0; 

